Conference stats in this case are pretty misleading, as our conference has strong defenses and weak offenses, and also most teams in the conference play vastly weaker non-conference schedules than we do. A better comparison would be conference stats in only conference games.
Nationally we rank #78 in total offense and #21 in total defense. This gives a much better picture of where we stand.
And finally, passing yardage is fairly poor measure of success, on both sides of the ball but especially defense. If you look at rushing yardage and pass efficiency those are much better indicators. In this case, we are #2/#35 (conference/nationally) in rushing yardage, while #8/#92 in passing efficiency. Meanwhile on the defensive side we are #3/#11 in rushing yardage defense and #3/#9 in pass efficiency defense.
If you look at those last numbers, it tells you all you need to know - our passing offense stinks and needs fixing. (Actually not quite all you need to know, our kickoffs and kickoff coverage were also major trouble spots.)